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Warehouse Receivables & Warehouse Lines of Credit - Summary of Warehouse Lines of Credit in Place (Detail) - USD ($)
12 Months Ended
Oct. 21, 2019
Dec. 31, 2019
Dec. 31, 2018
Jun. 28, 2019
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Carrying Value   $ 977,175,000 $ 1,328,761,000  
Warehouse Agreement Borrowings [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Maximum Facility Size   3,400,000,000 2,600,000,000  
Carrying Value   977,175,000 1,328,761,000  
Warehouse Agreement Borrowings [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Carrying Value   $ 977,175,000 1,328,761,000  
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 1.30%, maturing October 21, 2019 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity Oct. 19, 2020 Oct. 19, 2020    
Maximum Facility Size   $ 985,000,000 985,000,000  
Carrying Value   $ 267,075,000 $ 871,680,000  
Line of credit over LIBOR rate   1.30% 1.30%  
Warehouse Agreement Borrowings [Member] | JP Morgan [Member] | Pricing at daily one-month LIBOR plus 2.75%, maturing October 21, 2019 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity Oct. 19, 2020 Oct. 19, 2020    
Maximum Facility Size   $ 15,000,000 $ 15,000,000  
Line of credit over LIBOR rate   2.75% 2.75%  
Warehouse Agreement Borrowings [Member] | Fannie Mae ASAP Program [Member] | Pricing at daily one-month LIBOR plus 1.35%, with a LIBOR floor of 0.35%, Cancelable anytime [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   Cancelable anytime    
Maximum Facility Size   $ 450,000,000 $ 450,000,000  
Carrying Value   $ 360,784,000 $ 149,089,000  
Line of credit over LIBOR rate   1.35% 1.35%  
Line of credit, LIBOR floor rate   0.35% 0.35%  
Warehouse Agreement Borrowings [Member] | TD Bank [Member] | Pricing at daily one-month LIBOR plus 1.15%, maturing June 30, 2020 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   Jun. 30, 2020    
Maximum Facility Size   $ 800,000,000 $ 400,000,000  
Carrying Value   $ 92,266,000 $ 165,945,000  
Line of credit over LIBOR rate   1.15% 1.15%  
Warehouse Agreement Borrowings [Member] | Bank Of America | Pricing at daily one-month LIBOR plus 1.15%, maturing May 27, 2020 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   May 27, 2020    
Maximum Facility Size   $ 250,000,000 $ 200,000,000  
Carrying Value   $ 17,457,000    
Line of credit over LIBOR rate   1.15% 1.15%  
Warehouse Agreement Borrowings [Member] | Bank Of America | Pricing at daily one-month LIBOR plus 1.30%, maturing June 4, 2019 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   Jun. 04, 2019    
Maximum Facility Size     $ 225,000,000  
Carrying Value     $ 21,852,000  
Line of credit over LIBOR rate   1.30% 1.30%  
Warehouse Agreement Borrowings [Member] | Bank Of America | Pricing at daily one-month LIBOR plus 1.20%, maturing May 27, 2020 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   May 27, 2020    
Maximum Facility Size   $ 350,000,000    
Carrying Value   $ 189,465,000    
Line of credit over LIBOR rate   1.20% 1.20%  
Warehouse Agreement Borrowings [Member] | MUFG Union Bank, N.A. (Union Bank) [Member] | Pricing at daily one-month LIBOR plus 1.20%, maturing June 28, 2020 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   Jun. 28, 2020    
Maximum Facility Size   $ 350,000,000   $ 200,000,000.0
Carrying Value   $ 10,590,000    
Line of credit over LIBOR rate   1.20% 1.20%  
Warehouse Agreement Borrowings [Member] | Capital One [Member] | Pricing at daily one-month LIBOR plus 1.25%, maturing July 27, 2020 [Member]        
Warehouse Receivables And Warehouse Lines Of Credit [Line Items]        
Current Maturity   Jul. 27, 2020    
Maximum Facility Size   $ 200,000,000 $ 325,000,000  
Carrying Value   $ 39,538,000 $ 120,195,000  
Line of credit over LIBOR rate   1.25% 1.25%